Summary of ACME PACKET INC

Change in Directors or Principal Officers, Regulation FD Disclosure, Financial St

Item 5.02 Departure of Directors of Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

On October 23, 2008, the Board of Directors of Acme Packet, Inc. (the "Company") appointed Michael Thurk to fill the vacancy on the Board of Directors effective immediately. Mr. Thurk will serve as a Class I Director whose term will expire at the annual meeting of stockholders to be held in 2010. The Company's Nominating and Corporate Governance Committee recommended the appointment of Mr. Thurk to the Board of Directors. The Board of Directors determined that Mr. Thurk is independent within the meaning of the Marketplace Rules of the Nasdaq Stock Market, LLC.

Pursuant to the Company's 2006 Director Option Plan, Mr. Thurk received an option award for 12,500 shares of common stock, which shall vest in four equal quarterly installments, for his initial appointment to the Board. Mr. Thurk also will receive $50,000 per year for his services as a member of the Company's Board of Directors.

Item 7.01 Regulation FD Disclosure

On October 27, 2008, the Company issued a press release announcing the appointment of Mr. Thurk as a member of the Board of Directors of the Company. A copy of this press release is furnished as Exhibit 99.1 to this report.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit                                     Description

99.1             Press release dated October 27, 2008, entitled "Acme Packet
                 Expands Board of Directors with Addition of Former Avaya COO
                 Michael Thurk"